Whitney Houston's Family Cissy is EXPLOITINGWhitney's Death For Cash

6/10/2012 6:30 AM PDT

Whitney Houston's Family -- Cissy is Exploiting Whitney's Death For Cash

EXCLUSIVE

Whitney Houston's mom is pulling a Joe Jackson -- cashing in on her child's tragic death ... that's what some family members think of Cissy Houston's plans to write a tell-all book.

Sources close to the Houston family tell TMZ ... Cissy's new publishing deal with Harper-Collins for a memoir is merely a lame attempt to make money -- since Whitney left everything to Bobbi Kristina -- and not at all about honoring the late singer.

One source said the book -- which is slated for release next year -- could also be a PR move for Cissy, claiming ... "She will try to come out looking like the world's greatest mom, when in actuality, she wasn't."